DC2126A 2 page flyer

Wireless Temperature Sensor
AMBIENT LIGHT
EXTENDS BATTERY
LIFE INDEFINITELY
LIGHT
SOLAR PANELS
LTC®3330
ENERGY HARVESTER IC
PRECISION 0.1°C
TEMPERATURE
MEASUREMENT
ACCURACY
ULTRALOW
SELF-DISCHARGE
BATTERY
(ON BACK)
HIGHLY RELIABLE
SMARTMESH IP
WIRELESS NETWORK
The DC2126A is a high accuracy wireless temperature sensor, powered from ambient light, built using Linear Technology integrated circuits.
A 24-bit delta-sigma ADC reads a thermistor biased from a precision voltage reference. A switching power supply harvests energy from the builtin solar panel, and automatically switches over to the internal battery when no ambient light is available. A SmartMesh IP™ wireless radio module
provides the wireless mesh connectivity and communicates the temperature to a central access point (manager).
DC2126A Components
SOLAR
PANEL
BATTERY
LTC3330
EH_ON
GPIO
WIRELESS
NETWORK
LDO_EN
LDO_OUT
3.0V (DUTY CYCLE)
VOUT
3.6V
LTC6654-2.5
VSUPPLY
LTP5901-IPM
SPI
LTC2484
THERMISTOR
BRIDGE
Figure 1. A Wireless temperature sensor is formed by connecting a wireless radio module to an ADC, reference
and thermistor. The circuit is powered by an energy harvester that can take power from a battery or solar panel.
L, LT, LTC, LTM, Linear Technology, the Linear logo, the Dust Networks logo, Dust Networks, Eterna, Manager-on-Chip, and SmartMesh are registered
trademarks and Easy Drive, LTP, Mote-on-Chip, and SmartMesh IP are trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
DC2126A Components
Part Number
Function
Benefits
LTC2484
24-Bit Delta-Sigma ADC, Reads Thermistor
Easy Drive™ Inputs Allow Direct Hook-Up of Thermistor
LT®6654
Low Noise Voltage Reference
Bias Thermistor for Low Noise Reading of Temperature
LTP 5901-IPM
SmartMesh IP Mote PCB Module
Automatically Forms Low Power, Reliable Wireless Mesh Network.
Built-In Microprocessor Manages ADC and Power Supplies
LTC3330
Energy Harvesting DC/DC Converter
Prioritizes Between Solar Power and Battery Power
™
The DC2126A acts as a wireless node, or mote, in a SmartMesh IP network. Temperature readings are sent through the mesh network to a
demonstration PC software GUI that displays temperature, and whether the DC2126A is running on solar power or on battery.
DC2126A
DC9000B SmartMesh IP
STARTER KIT
DC2126A RECEIVER
EXAMPLE SOFTWARE GUI
DC2126A Software Utilities
ADDITIONAL REFERENCES
Online Description of the DC2126A with documentation www.linear.com/demo/DC2126A
Step By Step Instructions to Operate the DC2126A www.linear.com/docs/45351
Article Describing Theory of Operation of the DC2126A Circuit www.linear.com/docs/45098
Other SmartMesh IP Demo Boards www.linear.com/starterkits
www.linear.com/dc2126a n 1-800-4-LINEAR
1014
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